Structural setting and tectonic evolution of the Apennine Units of northern Calabria

A new structural-stratigraphic synthesis of the Apennine units of northern Calabria is presented. The Meso-Cenozoic successions are grouped into two tectonic units, named Pollino-Ciagola Unit (PCU) and Lungro-Verbicaro Unit (LVU), comprising terrains formerly attributed to five different tectonic units. Fe-Mg carpholite and blue amphibole record HP-LT metamorphism in the LVU, followed by progressive decompression leading to final greenschist facies re-equilibration during dominantly extensional deformation. Final tectonic emplacement of the LVU over the PCU post-dated the metamorphism of the LVU and was accompanied by intense ductile deformation along zones of strain localisation in footwall rocks. All of the units were later affected by folding and minor thrusting during subsequent Apennine tectonics.